2.6.33-rc8-rt1
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From: John Kacur on 22 Feb 2010 06:20 On Mon, Feb 22, 2010 at 12:24 AM, Thomas Gleixner <tglx(a)linutronix.de> wrote: > We are pleased to announce the next update to our new preempt-rt > series. > > � �- Forward to 2.6.33-rc8 > > Finally I managed to get that beast tamed. > > Some folks were already joking, that my dog ate the 33-rt patch. The > truth is that my reject fixup skills were one line off in the mm/* > code which resulted in -rt eating my files :) > > When I fixed the wreckage of my own stupidty I found out that -rt > triggered a nasty and hard to reproduce mainline scheduler bug, which > refused to reproduce with kernel tracing enabled. Thanks to Peter > Zijlstra for helping me to decode the initial mainline problem and the > ones which resulted from fixing the mainline bug! > > It's all fixed now and I'm pretty happy about the state of this > release with the following exceptions: > > �1) it is only runtime tested on x86_64 (compiles on x86_32, arm, > � �powerpc_32/64). > > � �I'm going to throw it at my testing infrastructure tomorrow, but I > � �wanted to release this before .33-final and of course you folks > � �are heartely invited to help out with fixing the fallout :) > > �2) I broke the histogram tracer stuff simply because I got lost in > � �the divergence of -rt and mainline kernel/trace/* changes > > � �I apologize to Carsten, but I'm sure he will fix that in no time > � �as usual > > The current state of the patch on x86_64 is: rock stable! > > � �[rt-tests]# chrt -f 1 ./cyclictest -t -a -n -d0 -p80 -i125 > � �policy: fifo: loadavg: 509.19 490.53 486.66 364/1055 31899 > > � �T: 0 (27682) P:80 I:125 C:1170997397 Min: 2 Act: 3 Avg: 3 Max: 34 > � �T: 1 (27683) P:79 I:125 C:1170997397 Min: 2 Act: 3 Avg: 3 Max: 34 > > � �That's an uptime of ~1.6 days with a load of hackbench, recursive > � �grep and extensive networking traffic going on. > > The merge of the spinlock namespace cleanup and the initial > annotations took a big chunk away from the -rt patch size: > > � � � �patch-2.6.31.12-rt21.patch � � 1680354 > � � � �patch-2.6.33-rc8.patch � � � � 1179390 > � � � �patch-2.6.33-rc8+git.patch � � 1067064 > > We are zooming in, but there is still a way to go! > Woohoo! More -rt fun. Unfortunately, I can't log in on my T500 with this kernel though. The following shows-up on my serial console. ------------[ cut here ]------------ WARNING: at /home/jkacur/rt.linux.git/net/mac80211/rx.c:2467 ieee80211_rx+0x4c/0 x721 [mac80211]() Hardware name: 2241B48 Modules linked in: bridge stp bnep sco btusb l2cap crc16 bluetooth sunrpc ipt_RE JECT nf_conntrack_ipv4 nf_defrag_ipv4 iptable_filter ip_tables ip6t_REJECT xt_tc pudp nf_conntrack_ipv6 xt_state ip6table_filter ip6_tables x_tables ipv6 cpufreq _ondemand acpi_cpufreq ext3 jbd mbcache dm_mirror dm_region_hash dm_log dm_multi path scsi_dh dm_mod kvm_intel kvm uinput arc4 ecb snd_hda_codec_conexant iwlagn snd_hda_intel iwlcore snd_hda_codec snd_hwdep snd_seq_dummy mac80211 snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss thinkpad_ac pi snd_pcm firewire_ohci firewire_core hwmon video ppdev tpm_tis cfg80211 sr_mod battery wmi ricoh_mmc parport_pc sg tpm cdrom tpm_bios button ac ata_generic e1 000e iTCO_wdt snd_timer sdhci_pci pata_acpi sdhci i2c_i801 i2c_core parport mmc_ core iTCO_vendor_support snd joydev snd_page_alloc pcspkr intel_agp soundcore cr c_itu_t rfkill output ahci libata sd_mod scsi_mod crc_t10dif xfs exportfs uhci_h cd ohci_hcd ehci_hcd [last unloaded: microcode] Pid: 10, comm: sirq-tasklet/0 Not tainted 2.6.33-rc8-rt1-debug #1 Call Trace: [<ffffffffa033524f>] ? ieee80211_rx+0x4c/0x721 [mac80211] [<ffffffff81041f25>] warn_slowpath_common+0x77/0xa4 [<ffffffff81041f61>] warn_slowpath_null+0xf/0x11 [<ffffffffa033524f>] ieee80211_rx+0x4c/0x721 [mac80211] [<ffffffffa039f380>] ? iwl_led_pattern+0x17a/0x189 [iwlcore] [<ffffffff810c0fd1>] ? free_compound_page+0x16/0x18 [<ffffffffa039f3f5>] ? iwl_leds_background+0x66/0x219 [iwlcore] [<ffffffffa0393524>] iwl_rx_reply_rx+0xc29/0xc5a [iwlcore] [<ffffffff8106ee74>] ? trace_hardirqs_on+0xd/0xf [<ffffffff8135cf7e>] ? _raw_spin_unlock_irqrestore+0x4c/0x68 [<ffffffff811b4e32>] ? unmap_single+0x27/0x4f [<ffffffffa03cec81>] iwl_rx_handle+0x2a0/0x48d [iwlagn] [<ffffffff8135cf7e>] ? _raw_spin_unlock_irqrestore+0x4c/0x68 [<ffffffffa03cfbb3>] iwl_irq_tasklet+0x5a3/0x73f [iwlagn] [<ffffffff81047b5a>] __tasklet_action+0x8f/0xfd [<ffffffff81047cc9>] tasklet_action+0x7c/0x85 [<ffffffff81048209>] run_ksoftirqd+0x18e/0x2d5 [<ffffffff8104807b>] ? run_ksoftirqd+0x0/0x2d5 [<ffffffff8105d794>] kthread+0x8c/0x94 [<ffffffff8135cfca>] ? _raw_spin_unlock+0x30/0x4b [<ffffffff81003a54>] kernel_thread_helper+0x4/0x10 [<ffffffff8135d340>] ? restore_args+0x0/0x30 [<ffffffff8105d708>] ? kthread+0x0/0x94 [<ffffffff81003a50>] ? kernel_thread_helper+0x0/0x10 ---[ end trace 01358557eee38037 ]--- Thanks -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Thomas Gleixner on 22 Feb 2010 06:40 On Mon, 22 Feb 2010, John Kacur wrote: > On Mon, Feb 22, 2010 at 12:24 AM, Thomas Gleixner <tglx(a)linutronix.de> wrote: > > We are zooming in, but there is still a way to go! > > > > Woohoo! More -rt fun. > > Unfortunately, I can't log in on my T500 with this kernel though. > The following shows-up on my serial console. > ------------[ cut here ]------------ > WARNING: at /home/jkacur/rt.linux.git/net/mac80211/rx.c:2467 ieee80211_rx+0x4c/0 > x721 [mac80211]() Fix below. Thanks, tglx ---- diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index 82a30c1..e735c17 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -2464,7 +2464,7 @@ void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) struct ieee80211_supported_band *sband; struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); - WARN_ON_ONCE(softirq_count() == 0); + WARN_ON_ONCE_NONRT(softirq_count() == 0); if (WARN_ON(status->band < 0 || status->band >= IEEE80211_NUM_BANDS)) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: John Kacur on 22 Feb 2010 07:30 On Mon, Feb 22, 2010 at 12:28 PM, Thomas Gleixner <tglx(a)linutronix.de> wrote: > On Mon, 22 Feb 2010, John Kacur wrote: >> On Mon, Feb 22, 2010 at 12:24 AM, Thomas Gleixner <tglx(a)linutronix.de> wrote: >> > We are zooming in, but there is still a way to go! >> > >> >> Woohoo! More -rt fun. >> >> Unfortunately, I can't log in on my T500 with this kernel though. >> The following shows-up on my serial console. >> ------------[ cut here ]------------ >> WARNING: at /home/jkacur/rt.linux.git/net/mac80211/rx.c:2467 ieee80211_rx+0x4c/0 >> x721 [mac80211]() > > Fix below. Thanks, > > � �tglx > ---- > diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c > index 82a30c1..e735c17 100644 > --- a/net/mac80211/rx.c > +++ b/net/mac80211/rx.c > @@ -2464,7 +2464,7 @@ void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) > � � � �struct ieee80211_supported_band *sband; > � � � �struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); > > - � � � WARN_ON_ONCE(softirq_count() == 0); > + � � � WARN_ON_ONCE_NONRT(softirq_count() == 0); > > � � � �if (WARN_ON(status->band < 0 || > � � � � � � � � � �status->band >= IEEE80211_NUM_BANDS)) > -- Thanks Thomas That patch fixes the symptom I reported, but unfortunately, I still can't log-in to my laptop without the machine freezing. Not sure why, investigating. John -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Luis Claudio R. Goncalves on 22 Feb 2010 07:40 On Mon, Feb 22, 2010 at 01:23:33PM +0100, John Kacur wrote: | On Mon, Feb 22, 2010 at 12:28 PM, Thomas Gleixner <tglx(a)linutronix.de> wrote: | > On Mon, 22 Feb 2010, John Kacur wrote: | >> On Mon, Feb 22, 2010 at 12:24 AM, Thomas Gleixner <tglx(a)linutronix.de> wrote: | >> > We are zooming in, but there is still a way to go! | >> > | >> | >> Woohoo! More -rt fun. | >> | >> Unfortunately, I can't log in on my T500 with this kernel though. | >> The following shows-up on my serial console. | >> ------------[ cut here ]------------ | >> WARNING: at /home/jkacur/rt.linux.git/net/mac80211/rx.c:2467 ieee80211_rx+0x4c/0 | >> x721 [mac80211]() | > | > Fix below. Thanks, | > | > � �tglx | > ---- | > diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c | > index 82a30c1..e735c17 100644 | > --- a/net/mac80211/rx.c | > +++ b/net/mac80211/rx.c | > @@ -2464,7 +2464,7 @@ void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) | > � � � �struct ieee80211_supported_band *sband; | > � � � �struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); | > | > - � � � WARN_ON_ONCE(softirq_count() == 0); | > + � � � WARN_ON_ONCE_NONRT(softirq_count() == 0); | > | > � � � �if (WARN_ON(status->band < 0 || | > � � � � � � � � � �status->band >= IEEE80211_NUM_BANDS)) | > -- | | Thanks Thomas | | That patch fixes the symptom I reported, but unfortunately, I still | can't log-in to my laptop without the machine freezing. | Not sure why, investigating. John, I have a similar issue. But I suspect it may be KMS related (I had a similar issue on the early 2.6.31-rt days). I also noticed that the keyboard is kinda crazy (echoing a lot) on console. As soon as I have more results I will post them here. Luis -- [ Luis Claudio R. Goncalves Red Hat - Realtime Team ] [ Fingerprint: 4FDD B8C4 3C59 34BD 8BE9 2696 7203 D980 A448 C8F8 ] -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Dan Carpenter on 22 Feb 2010 08:30
kernel/trace/latency_hist.c 373 static ssize_t 374 latency_hist_show_maxlatproc(struct file *filp, char __user *ubuf, 375 size_t cnt, loff_t *ppos) 376 { 377 char buf[1024]; This is a large buffer to put on the stack. regards, dan carpenter -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |